fix(analysis): native library backfill coordinator for advanced strategy (#881)

* feat(analysis): native library backfill coordinator for advanced strategy

Move advanced analytics scheduling from the webview loop into a Rust
background worker (configure + spawn_blocking batch/enqueue), matching
cover backfill. Scan hash+BPM gap tracks instead of the full library;
suppress low-priority analysis UI events; limit loudness refresh IPC to
the playback window.

* fix(analysis): flat backfill configure IPC and restore probe track-perf

Use flattened Tauri args like cover backfill so release/prod invoke works;
keep emitting analysis:track-perf for library low-priority work so Performance
Probe tpm/last-track stats update while waveform/enrichment UI events stay suppressed.

* chore(analysis): fix clippy and drop duplicate TS backfill policy

Allow too_many_arguments on library_analysis_backfill_configure for CI;
remove unused frontend batch API and TS watermark helpers now owned in Rust;
clarify analysis_emits_ui_events comment for low-priority track-perf.

* docs: CHANGELOG and credits for PR #881 native analysis backfill

src-tauri/src/lib.rs

@@ -3,6 +3,7 @@
 
 pub mod cli;
 mod cover_cache;
+mod library_analysis_backfill;
 mod lib_commands;
 
 pub use psysonic_integration::discord;
@@ -123,6 +124,9 @@ pub fn run() {
             cover_cache::init_cover_cache(app.handle())
                 .map_err(|e| format!("cover cache init failed: {e}"))?;
 
+            library_analysis_backfill::init_library_analysis_backfill(app.handle())
+                .map_err(|e| format!("library analysis backfill init failed: {e}"))?;
+
             // ── Library track store (psysonic-library, PR-5a + PR-5b) ─────
             // PR-5a brought up the read-only Tauri surface + LibraryRuntime.
             // PR-5b adds the mutating commands, sync session map, current-job
@@ -734,6 +738,7 @@ pub fn run() {
             psysonic_library::commands::library_migrate_server_index_keys,
             psysonic_library::commands::library_delete_server_data,
             psysonic_library::commands::library_analysis_backfill_batch,
+            library_analysis_backfill::library_analysis_backfill_configure,
             psysonic_library::commands::library_resolve_cover_entry,
             cover_cache::cover_cache_peek_batch,
             cover_cache::cover_cache_ensure,